bergmaxn



(No Model.)

S. BERGMANN.

BQUALIZER PoR ELECTRIC GURRBNTS.

N0. 398,121. Patented Feb. 1&3, 1889.

Jag 6 w UNITED STATES PATENT OEEICE.

SIGMND BERGMANN, OF EY YORK, N. Y.

EQUALIZER FOR ELECTRIC CURRENTS.

SPECIFICATION forming part of Letters Patent No. 398,121, dated February 19, 1889.

Application filed November 10, 1888. Serial No. 290,447. (No model.)

.To aZZ whom, it may concern:

Be it known that I, Sicnvnn BERGMANN, of New York, in the county and State of New York, have invented a certain new and useful Improvement in Equalizers for Electric Currents, of which the following' is a specification.

ln the accompanying drawings, Figure l is an end view of myinvention.

bination of parts, as hereinafter set forth, and

pointed out in the appended claims.

ergy caused by the drop of potential in this ,f resistance in order to equalize the potential in the feeder. Hcretofore these equalizers have been placed in or provided with wooden frames, which is found objectionable, inasmuch as they are so readily ignited and burn ed, endangering both life and property.

The object of t-he present invention is to providea metal frame or casing for the resistance-coils of the equalizer, which are preferably insulated at their points of support.

In the wooden frames the degree of heat, withstood is SOOO Fahrenheit, and in the metal frame herein described the degree of heat may be increased to any practical degree less than that required to melt the metal.

A further object is to cconomize in space. An equalizer of the ordinary construction to 'carry one hundred ampres with twenty-volts drop requires a frame twenty-l`our feet by twenty-four feet in cross-section by sixty feet in length, whereas in my improved frame the saine energy can be dissipated in a space of eighteen feet by eighteen feet in cross-section i and twenty-fourfeetin length, thus using less resistance-wire.

In the wooden frames the coils are usually connected by means of soft solder, as the low temperature made necessary by the use of wood never endangers or melts the connections. However, in the present instance, where a great degree of heat is expended, it is found necessary to connect the ends of the wires by brazing.

Referring by letter to the drawings, A des ignates a metal frame comprising' the uprights B, which are preferably tubular, and the top and bottom castings C, having threaded openings to receive the threaded ends of l the uprights, or the said parts may be otherwise secured together without departing' from the spirit of my invention. Itis found necessaryin central-station work to have the ends of the various feeders at the f .i the whole construction is greatly diminished and the strength of said uprights is increased. The resistance-coils D have their ends projected through openings in the transverse metal strips E, and the said ends are preferably connected in their proper relations by braziug, as the degree of heat possible would destroythe solder connections heretofore employed.

The transverse strips E mayhave openings near their ends to engage aprojection, o, on the insulators F, which are preferably seated in depressions a in the end plates, as plainly shown in Fig. 3. These insulators F are preferably of an incombustible material-such7 for instance, as porcelain, glass, or like material. A disk or washer, l), of asbestus or similar flexible non-combustible material, may be placed around the projections of the insulator beneath the lower face of the transverse strip E, so that the said insulators will not be endan gered by any sudden shock received by the frame.

In Figs. i and 5 I have shown the end castings as made in plate form, with the insulators F seated in depressions therein, and in Fig. 6 l have shown the insulators as having diverging sides, or in the forni' of a concfrustum and extended through suitable openings in/the plate. In the examples last described the insulators are perforated at b for the passage of the coil ends.

It is to be understood that the formation ot' the frame may be varied to suit the requirements, as I only confine myself herein to an iron or other metal frame.

Having described my invention, what I claim isl. In an equalizer for electric currents, the combin ation, with the coils, of the metal frame comprising the uprights having the threaded ends, the end castings or plates havin g thread ed openings engaging' the uprights, and the insulators in said end castings or plates, substantially as specified.

2. In a-n equalizer for electric currents, the combination, with the coils, of `the metal np-V rights, the metal end plates secured thereto having the openings, and the perforated ins'n- I lators in said openings receiving the ends of the coils, substantially as specified.

3. In an equalizer for electric currents, the combination, with the resistance-coils and the metal frame, of the transverse metal strips, the insulators between said strips and the frame, and disks of iiexible material interposed between the insulators andthe transverse strips, substantialbY as specified.

4. In an electrical equalizer, the combina-- tion, With the coils and the metal frame, of the transverse strips having the openings, the insulators between the strips and the frame having the projection, and the iiexible Washer surrounding said projection below the lower face of thetransverse strips, substantially as specified.

SIGMUND BERGMANN. 

